Summary

The Feishu error 200340 when clicking command approval buttons still occurs in the latest release v0.15.2. PR #10256 provides the correct fix but remains unmerged.

Current Status

• Latest release: v0.15.2 (2026-05-29) - error still present
• Root cause: card.data requires JSON string but receives Python dict
• Existing fix: PR fix(feishu): serialize approval callback card data to JSON string #10256 (open since 2026-04-15)
• Related open issues: Feishu command approval card buttons fail with error code 200340 #10251, [Bug]: [Feishu Mobile] Command approval card returns error code:200340 on any option click despite card.action.trigger being configured #10073, [Bug]: 飞书中进行审核，出现200340错误 #8246, Feishu: Command Approval buttons return "出错了，请稍后再试 code: 220340" when clicked #13924

Evidence

1. Code inspection shows gateway/platforms/feishu.py line 2623:

   card.data = self._build_resolved_approval_card(choice=choice, user_name=user_name)

   _build_resolved_approval_card() returns a dict, but Feishu API expects JSON string.

2. PR fix(feishu): serialize approval callback card data to JSON string #10256 correctly fixes this with:

   card.data = json.dumps(
       self._build_resolved_approval_card(choice=choice, user_name=user_name),
       ensure_ascii=False,
   )

3. Issue [Bug]: Feishu approval card fails to update after button click (error 200340) #10154 was closed after PR fix(feishu): resolve approval cards inline from callback path #9871 merged, but that PR only fixed async→sync callback flow, not the serialization issue.

Why This Matters

• Users continue to report the same error (latest: [Bug]: [Feishu Mobile] Command approval card returns error code:200340 on any option click despite card.action.trigger being configured #10073, 2026-05-09)
• Workarounds exist (/approve command, local patches) but degrade UX
• The fix is minimal, tested, and ready to merge

Requested Actions

1. Merge PR fix(feishu): serialize approval callback card data to JSON string #10256 to fix the serialization issue
2. Close duplicate issues (Feishu command approval card buttons fail with error code 200340 #10251, [Bug]: [Feishu Mobile] Command approval card returns error code:200340 on any option click despite card.action.trigger being configured #10073, [Bug]: 飞书中进行审核，出现200340错误 #8246, Feishu: Command Approval buttons return "出错了，请稍后再试 code: 220340" when clicked #13924) after merge
3. Consider a patch release (v0.15.3) to address this recurring bug

Additional Context

• PR fix(feishu): serialize approval callback card data to JSON string #10256 has been open for 48 days with no CI checks or review
• Collaborator @alt-glitch identified this as duplicate but lacks merge permissions
• Multiple community members have confirmed the issue persists

Labels: type/bug, platform/feishu, P2